xmlLoad stream总结

1.问题 “缺少根元素”

   1）.指定下encoding,文件保存的编码和xmldoc读取时用的编码不一致可能就会出问题

   2）.xmlLoad 的stream必须是filestream类型，如果不是filestream类型的要指定mstream.Position = 0;或mstream.Seek(0, SeekOrigin.Begin);

         然后再编码你想要的编码：

            this.context.Request.InputStream.Position = 0;
            StreamReader readStream = new StreamReader(this.context.Request.InputStream, Encoding.GetEncoding("gb2312"));
            doc.Load(readStream);

 

post xml 文件方法：

public static XmlDocument PostXMLTransaction(string v_strURL, XmlDocument v_objXMLDoc)
        {
            //Declare XMLResponse document
            XmlDocument XMLResponse = null;

            //Declare an HTTP-specific implementation of the WebRequest class.
            HttpWebRequest objHttpWebRequest;

            //Declare an HTTP-specific implementation of the WebResponse class
            HttpWebResponse objHttpWebResponse = null;

            //Declare a generic view of a sequence of bytes
            Stream objRequestStream = null;
            Stream objResponseStream = null;

            //Declare XMLReader
            XmlTextReader objXMLReader;

            //Creates an HttpWebRequest for the specified URL.
            objHttpWebRequest = (HttpWebRequest)WebRequest.Create(v_strURL);

            try
            {
                //---------- Start HttpRequest

                //Set HttpWebRequest properties
                byte[] bytes;
                bytes = System.Text.Encoding.GetEncoding("gb2312").GetBytes(v_objXMLDoc.InnerXml);
                objHttpWebRequest.Method = "POST";
                objHttpWebRequest.ContentLength = bytes.Length;
                objHttpWebRequest.ContentType = "text/xml; encoding='gb2312'";

                //Get Stream object
                objRequestStream = objHttpWebRequest.GetRequestStream();

                //Writes a sequence of bytes to the current stream       
                objRequestStream.Write(bytes, 0, bytes.Length);

                //Close stream
                objRequestStream.Close();

                //---------- End HttpRequest

                //Sends the HttpWebRequest, and waits for a response.
                objHttpWebResponse = (HttpWebResponse)objHttpWebRequest.GetResponse();

                //---------- Start HttpResponse
                if (objHttpWebResponse.StatusCode == HttpStatusCode.OK)
                {
                    //Get response stream
                    objResponseStream = objHttpWebResponse.GetResponseStream();

                    //Load response stream into XMLReader
                    objXMLReader = new XmlTextReader(objResponseStream);

                    //Declare XMLDocument
                    XmlDocument xmldoc = new XmlDocument();
                    xmldoc.Load(objXMLReader);

                    //Set XMLResponse object returned from XMLReader
                    XMLResponse = xmldoc;

                    //Close XMLReader
                    objXMLReader.Close();
                }

                //Close HttpWebResponse
                objHttpWebResponse.Close();
            }
            catch (WebException we)
            {
                //TODO: Add custom exception handling
                throw new Exception(we.Message);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                //Close connections
                objRequestStream.Close();
                objResponseStream.Close();
                objHttpWebResponse.Close();

                //Release objects
                objXMLReader = null;
                objRequestStream = null;
                objResponseStream = null;
                objHttpWebResponse = null;
                objHttpWebRequest = null;
            }

            //Return
            return XMLResponse;
        }